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Landsliding and the evolution of normal fault-bounded mountains.\ud

By A.L. Densmore, M.A. Ellis and R.S. Anderson

Abstract

Much of the tectonic and climatic history in high-relief regions, such as the mountains of the western U.S. Basin and Range province, is contained in the morphology of hillslopes, drainage networks, and other landforms that range in scale from 10−1 to 101km. To understand how these landforms evolve, we have developed a numerical landscape evolution model that combines a detailed tectonic displacement field with a set of physically based geomorphic rules. Bedrock landsliding, long recognized as a significant geomorphic process in mountainous topography, is for the first time explicitly included in the rule set. In a series of numerical experiments, we generate synthetic landscapes that closely resemble mountainous topography observed in the Basin and Range. The production of realistic landscapes depends critically on the presence of bedrock landslides, and landsliding yields rates of long-term erosion that are comparable in magnitude to those of fluvial erosion. The erosive efficiency of bedrock landsliding implies that hillslopes may respond very quickly to changes in local base level and that fluvial erosion is the rate-limiting process in steady state experimental landscapes, Our experiments generate power law distributions of landslide sizes, somewhat similar to both field and laboratory observations. Thus even a simple model of bedrock landsliding is capable of quantitatively reproducing mountainous topography and landslide distributions and represents a significant step forward in our understanding of the evolution of normal-fault-bounded ranges

Publisher: American Geophysical Union
Year: 1998
DOI identifier: 10.1029/98JB00510
OAI identifier: oai:dro.dur.ac.uk.OAI2:7254
Journal:

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Citations

  1. (1980). A rock mass strength classification for geomorphic purposes: With tests from Antarctica and New Zealand,
  2. (1941). A sediment budget and an analysis of geomorphic processes in the Van Duzen River basin, north coastal
  3. (1939). Basin-Range structure of the Ruby-East Humboldt Range,
  4. (1995). Can we predict the rate of bedrock river incision using the stream power law? (abstract), Eos Trans.
  5. (1997). Department of Geology, Trinity College, Dublin 2, doi
  6. (1996). Erosion rates of Laramide summit surfaces: Implications for late Cenozoic increases in summit elevations (abstract),
  7. (1994). Escarpment evolution on high-elevation rifted margins: Insights derived from a surface process model that combines diffusion, advection, and reaction,
  8. (1989). Flexural uplift of rift flanks due to mechanical unloading of the lithosphere during extension, doi
  9. (1988). Formation of inner gorges,
  10. (1988). General models of long-term slope evolution through mass movement, in Slope Stability: Geotechnical Engineering and Geomorphology,
  11. (1980). Geology of Nevada: A discussion to accompany the Geologic Map of
  12. (1978). Geometry and rates of change of fault-generated range fronts, north-central
  13. (1995). Geomorphologically driven late Cenozoic rock uplift in the Sierra
  14. (1940). Geomorphology of the Ruby-East Humboldt Range,
  15. (1993). Hillslope Materials and Processes,
  16. (1997). Influence of rock strength properties on escarpment retreat across passive continental margins, doi
  17. (1978). Landslide occurrence in the western and central Northern Rocky Mountain physiographic province in Idaho,
  18. (1996). Large-scale geomorphology: Classical concepts reconciled and integrated with contemporary ideas via a surface processes model,
  19. (1960). Magnitude and frequency of forces in geomorphic processes, doi
  20. (1981). Mechanics of mountain-building and metamorphism in Taiwan,
  21. (1985). Predicting areal limits of earthquakeinduced landsliding,
  22. (1996). Predicting sediment flux from fold and thrust belts, doi
  23. (1978). Slope movement types and processes, in Landslides--Analysis and Control, edited by
  24. (1993). The displacement field of the Landers earthquake mapped by radar interferometry,
  25. (1988). The growth of geologic structures by repeated earthquakes, 2, Field examples of continental dip-slip faults,
  26. (1990). The origin of large local uplift in extensional regions,
  27. (1989). The topographic evolution of collisional mountain belts: A numerical look at the Southern Alps, New Zealand,
  28. (1994). Three-dimensional critical wedges: Tectonics and topography in oblique collisional orogens,
  29. (1982). Vegetation and climates of the last 4500 years in the vicinity of the Nevada Test Site, south-central

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